Glass for headlights.



H. D. COHEN.

GLASS FOR HEADLIGHTS.

APPLICATION HLED NOV. n, 1915.

Patented 'J uly 23, 1918.

ATT RNEYS.

HENRY D. COHEN, OF NEWARK, NEW JERSEY.

GLASS FOR HEADLIGHTS.

Application filed November 11. 1915.

To all whom it may concern:

Be it known that I, HENRY D. onnn, a citizen of the United States, and a resident of Newark, county of Essex, and State of New Jersey, have invented certain new and useful Improvements in Glasses for Headlights, of which the following is a specification.

This invention relates to a glass to be used in the headlights of automobiles, and is designed to provide a glass that protects the eyes of persons coming toward the automobile, and which at the same time permits the passage of light and diffuses the light so that the road or street in front of the automobile is illuminated sufficiently to give the driver of the automobile a good view of the roadway. The danger of riding with high-powered lights and reflectors has necessitated the passage of laws, in most States, that compel an automobile driver to lower the power of his lights or so dim them that persons coming in the opposite direction are not blinded so that they can not clearly see the road. The dimming of these lights has been done in a number of Ways, some automobilists simply covering the glass or lens in the reflector with soap or similar material, others using a translucent or opaque glass over a part of the lens, usually the upper part, while others have covered or darkened certain parts of the bulb of the electric light so as to control the direction of the rays from the bulb to the reflector. In some of these devices the dimming is sufficient and in others it is over-done, and in most of them it still is possible to get a sharp ray of light in the eyes when at a distance from the car, which is unpleasant and very often dangerous,

This invention is designed to provide a lens which is complete in itself and requires no coating or the. adjustment of additional parts, which permits the iassage of all the light from the reflector t n'ough the glass, but so diffuses and scatters the light that the roadway is well illuminated in front of the car, but there is no concentration of light at any point, unless it is at a selected point or points, which points are controlled y a proper disposition of plain or'transparcnt portions left in the glass. The glass of the headlight is made roughened on at least one of its faces so that the lighthitting the glass is diffused and scattered to a great extent, the glass at the sameitime having an Specification of Letters Patent.

Patented July 23, 1918.

Serial No. 60,836.

edge that is substantially smooth on both faces so that a tight joint can be made between the glass and the bezel or frame in which it is placed.

The invention is also designed to prevent the glass from rattling or moving in a rotative Way, this being accomplished by a clip which engages both the glass and the frame to prevent their rotative movement.

In the'drawing I show several embodiments of the invention, in which Figure 1 is a face view of one type, and Fig. 2 is a central vertical section taken through the glass shown in Fig. 1. Fig. 3 is a fragmentary view showing the lower part of a glass, the design being modified from that shown in Fig. 1, part of the frame for bolding the lass being illustrated to show the coiipcration ofthe parts.

The glass 10 is of any shape to conform to the type of lamp,- but it is usually made round. At least one of the faces of the glass is roughened as at 11, usually with a design that is somewhat irregular and with its whole surface that is to be affected being provided with such roughened surface so that the light passing through is diffused and scattered as shown at (tin Fig. 2. A strong light behind a glass of this kind would have its rays pass through thz lass to give an illuminalion on the side of fhc glass opposite the light, but there is no direct passage of light thcrelhrough and this diffusion and scattering, while giving sufficient illumination, does not affect the eye enough to make it uncomfortable to look at the glass. The, glass thus acts to make it so fe for an aufoniobilist to look toward the light without interfering with his own coinfort or ability to safely run his car. if desired, a smooth or transparent part 12 can be left in the glass, in the view this part being placed in the center, but it will be understood that if can be disposed where desired, sopn-linics lasing below the center to permit the (Lil'cct passage of light as at 7) in Fig. 2

do give at least one well defined spot of light on. I he road. The smooth or transparent part It! is usually placed so that its bright light does not at any point extend-more than four and one-half or five feet above the level of f||e road. The outer face .13 is usually left plain. as a roughened surface on that face would he more apt to catch the dust and remain clouded by reason of such dirt, whereas when it is. on the" inner face it does not be-.

come (lusty so quickly, and in ordol' to mom otl'ectually koop out tho dust and rain, a marginal rim 1-! is providod lllt'll is smooth on hoth sidos and \vhioh thus van ho tightly olanlpod hot \voon tho t'i'anio and hozol or hotwoon tho two walls of tho fi'anio that am known as lons franios and it! usod in hoad lights to hold the glass in position. Tho smooth taoos pol'init tho insoi't ion. il' doaii'od, ot' l'lll)b(l gaskots and Hllliiltlllixtlllt'fi \\'lllt'll alo voz'y ot'ton usod to pi'ovont latoral niovomeat of tho glass.

In Fig. 3 I allow a glass with a niodiliod form of (losign 15 in plat-o ot' tho ii'i'ogulal' oonliguration 11 shown in Fig. 1. and in this fignro show a part of a ti'aino lit in \vhioh tho glass is hold, this part. \vhioh is ohannolod, roooiving tho snoothod pol'iphovy ll of tho glass 10. Tho glass It) is providod with a notoh .17 ot' an)- dosirod l'ol'nl. in tho drawing tho notch hoin, V-shapod, and a spring with a projootingr part l8 tits into tho V shapod groovo 17 and has spring onds 19 that oxtond hotivoon tho glass and tho l l'ilillu 16, if dofiirod, so that thoy hind tho t-dgo of tho glam; and tho t'l'aino in a niannor to hold tho glass again rotativo nlovoniont by tho opol'ation of tho parts and ,Lftllllhl rattling, sinoo tho onds li oontinually pros tho glass so as to fOIOO its opposito edgo and hold its opposite edge tightly against tho innor fat'o of the frame of the hoad light.

This device has an advantage U\'t] a translucent or opaquo glass in that nono of tho light is lost. but is allouoil to pass through tho. glass, tho gonol'al illumination of the road hoiug sutlioiont for all political purposos, oven on dark highways. and thorough glass oan ho uaod without a coinplotoly translitlltlil part, sinoo tho diti'usod and scattorod light is autl'ioiont for tho purposos of ti'avol. In an opaque o1 il'tlliSlllUollt "lass thoro is nnn'o l'ojootion ollight by tho i-oal' faoo of tho glass. and tho illumination of tho road is lilnitod to a small spaoo and tho intonso light oauaos high lights and doop shadows \vhioh aro not so nial'kod in my form of glass on aoount of tho ditt'usion of tho light.

llaving thus doaorihod in invontioln l olaiinzl. A hoadlight comprising a t'i'anio, a glass in tho lralno. and a spring plaood hotwoon tho pol'ipholy of tho glass and tho innor faoo of tho frame, and prossing tho franio. outwardly and tho glass inwardy. tho glass having a root-as into \vhioh part of tho spring projoots.

A hoadlight Utillllfl'ifilllfl a t'i'anio. aglaas in tho fi'aino, tho glass having a V+liapod roooss in its pol'ipholzv, and a spring! with a V-shapod pal-t pi'ojooting into tho lLL'tSH and having a portion tying hotwoon tho glass and tho l'i'alno.

In tostiniony that I claim tho fm'ogoing, 1 have horounto sot my hand, this 10th datv of Noveinhor, 19L").

HENRY l). COHEN. 

